2008-06-27_REPORT - C1980007 (7)

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Well SOM-2-H \AL??e?. nn.li4?. nnrl Ginirl Parnmatarc F- I L • Mountain Coal West Elk Mine Monitoring Location Well SOM-2-1-1 Baseline' 2007 Water Year Description Units Minimum Maximum Mean Field Parameters Water Level Depth feet Electrical Conductivity µmhos/cm pH SU Temperature of Comment Obstructed Obstructed Obstructed Laboratory Parameters 3 Name of Certified Lab 2 Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /I Ammonia m /I 0.14 0.19 0.165 Anions me /I Arsenic, dissolved m /I 0.001 0.001 0.001 Arsenic, total m q/1 Bicarbonate m /I 989 1140 1064.5 Boron, dissolved m /I Cadmium, dissolved m /I 0 0 0 Calcium, dissolved m /I 4.6 4.6 4.6 Carbonate m /I Cation - Anion Balance % Cations me /I Chloride m /I 310 450 390 Conductivity µmhos/cm 2880 3060 2970 Copper, dissolved m /I Hardness m /I 21 37 29 H droxide m /I Iron, dissolved m /I 0 0.1 0.05 Iron, total m /l 1.76 19.4 7.56 Lead, dissolved m /I 0 0 0 Magnesium, dissolved m /l 2.4 2.4 2.4 Manganese, dissolved m /I 0.015 0.02 0.0175 Manganese, total m /I 0.037 0.27 0.11 Mercury, dissolved m /l 0 0 0 Molybdenum, dissolved m /I Nitrate/Nitrite as N m /I o 0.04 0.02 Nitrogen, ammonia m /I H SU 8.1 8.9 8.6 Phosphate m /I Phosphorus Ortho , dissolved m /I 0 0.007 0 Potassium, dissolved m /I Selenium, dissolved m /I 0 0 0 Selenium, total m /I Sodium Absorption Ratio SAR calc. 46.8 70.4 59 Sodium, dissolved m /l 739 739 739 Sulfate m /I 0 10 5 TDS Ratio calc. TDS Calc. m /l TDS m /I 1656 1760 1718 TSS m /I Zinc, dissolved mg/I 0 0 0 ' Baseline and WY 2000 data adapted from WWE (2001). 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels West Elk Mine G-14 2007 Annual Hydrology Report HydroGeo, Inc.